Gas fittings must be of good construction, sound material, of adequate strength and size and appropriate for the type of gas being used. The installation of lead pipes is prohibited and there are controls on the use of non-metallic pipes and fittings. Steps must be taken to prevent the release of gas during work on a gas fitting and fittings must be sealed and tested for gas tightness after work is completed. The use of ignition sources is prohibited where there is a risk of fire or explosion.